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The first two packs I tested were actually from a combined pack for an NCR machine. When the large pack was taken apart, I found two smaller packs inside in series to form a 24V supply for the single pack amp-hour rating. Both packs held 10 Ni-Cd batteries to make a 24V @ 1.4 Ah pack. So, each pack was 12V and 1.4 Ah. Refer to Figures 1 and 2.
But at the same time, it is also more prone to failure. The following are the cases summarised by BSLBATT lithium battery manufacturer. 1、The whole system does not work after the system is powered Common reasons are abnormal power supply, short circuit or break in the wiring harness, and no voltage output from DCDC.
Many of these can make a pack of batteries look like it’s suffering from a memory effect. The difference is seen when the pack is taken apart and each battery/cell is tested and/or recharged individually. The first problem I noticed with NiCd battery packs was that after a few years they would not hold a charge for as long as they did originally.
Here are some common problems which may seem like the memory effect. One or more weak batteries in the pack. Test: Measure the voltage of each battery; the weak one (s) will be lower in voltage. Sometimes much lower, but even if at zero volts these batteries can be brought back.
If it still doesn’t return the pack to its former glory, then the pack probably has failed due to one of the other failure modes listed previoiusly, or the memory effect can’t be reversed for some other reason. Klaus and I have had different experiences. Klaus feels sure he and his company really experienced some battery packs with a memory effect.
These were all AA NiCd batteries soldered together as a pack of six or eight cells, thus making 7.2 or 9.6 volt battery packs. The most common failure that I noticed was that one (or more) of the individual cells was much weaker than all the others.
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